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<title>概述</title>
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<tr><th colspan="5" align="center" valign="bottom">PostgreSQL 8.2.3 中文文档</th></tr>
<tr><td width="10%" align="left" valign="top"><a href="catalogs.html" accesskey="P">后退</a></td><td width="10%" align="left" valign="top"><a href="catalogs.html">快退</a></td><td width="60%" align="center" valign="bottom">章43. 系统表</td><td width="10%" align="right" valign="top"><a href="catalogs.html">快进</a></td><td width="10%" align="right" valign="top"><a href="catalog-pg-aggregate.html" accesskey="N">前进</a></td></tr>
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<div class="SECT1"><h1 class="SECT1"><a name="CATALOGS-OVERVIEW">43.1. 概述</a></h1>
<p><a href="catalogs-overview.html#CATALOG-TABLE">表43-1</a>列出了系统表。每个表更详细的文档在后面。</p>
<p>大多数系统表都是在数据库创建的过程中从模版数据库中拷贝过来的，因此都是数据库相关的。少数表是在整个安装中物理上所有数据库共享的；这些表在独立的表的描述中用指明了。</p>
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<p><b>表43-1. 系统表</b></p>
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<tr><td><a href="catalog-pg-aggregate.html"><tt class="STRUCTNAME">pg_aggregate</tt></a></td><td>聚集函数</td></tr>
<tr><td><a href="catalog-pg-am.html"><tt class="STRUCTNAME">pg_am</tt></a></td><td>索引访问方法</td></tr>
<tr><td><a href="catalog-pg-amop.html"><tt class="STRUCTNAME">pg_amop</tt></a></td><td>访问方法操作符</td></tr>
<tr><td><a href="catalog-pg-amproc.html"><tt class="STRUCTNAME">pg_amproc</tt></a></td><td>访问方法支持过程</td></tr>
<tr><td><a href="catalog-pg-attrdef.html"><tt class="STRUCTNAME">pg_attrdef</tt></a></td><td>字段缺省值</td></tr>
<tr><td><a href="catalog-pg-attribute.html"><tt class="STRUCTNAME">pg_attribute</tt></a></td><td>表的列(也称为"属性"或"字段")</td></tr>
<tr><td><a href="catalog-pg-authid.html"><tt class="STRUCTNAME">pg_authid</tt></a></td><td>认证标识符(角色)</td></tr>
<tr><td><a href="catalog-pg-auth-members.html"><tt class="STRUCTNAME">pg_auth_members</tt></a></td><td>认证标识符成员关系</td></tr>
<tr><td><a href="catalog-pg-autovacuum.html"><tt class="STRUCTNAME">pg_autovacuum</tt></a></td><td>每个关系一个的自动清理配置参数</td></tr>
<tr><td><a href="catalog-pg-cast.html"><tt class="STRUCTNAME">pg_cast</tt></a></td><td>转换(数据类型转换)</td></tr>
<tr><td><a href="catalog-pg-class.html"><tt class="STRUCTNAME">pg_class</tt></a></td><td>表、索引、序列、视图("关系")</td></tr>
<tr><td><a href="catalog-pg-constraint.html"><tt class="STRUCTNAME">pg_constraint</tt></a></td><td>检查约束、唯一约束、主键约束、外键约束</td></tr>
<tr><td><a href="catalog-pg-conversion.html"><tt class="STRUCTNAME">pg_conversion</tt></a></td><td>编码转换信息</td></tr>
<tr><td><a href="catalog-pg-database.html"><tt class="STRUCTNAME">pg_database</tt></a></td><td>本集群内的数据库</td></tr>
<tr><td><a href="catalog-pg-depend.html"><tt class="STRUCTNAME">pg_depend</tt></a></td><td>数据库对象之间的依赖性</td></tr>
<tr><td><a href="catalog-pg-description.html"><tt class="STRUCTNAME">pg_description</tt></a></td><td>数据库对象的描述或注释</td></tr>
<tr><td><a href="catalog-pg-index.html"><tt class="STRUCTNAME">pg_index</tt></a></td><td>附加的索引信息</td></tr>
<tr><td><a href="catalog-pg-inherits.html"><tt class="STRUCTNAME">pg_inherits</tt></a></td><td>表继承层次</td></tr>
<tr><td><a href="catalog-pg-language.html"><tt class="STRUCTNAME">pg_language</tt></a></td><td>用于写函数的语言</td></tr>
<tr><td><a href="catalog-pg-largeobject.html"><tt class="STRUCTNAME">pg_largeobject</tt></a></td><td>大对象</td></tr>
<tr><td><a href="catalog-pg-listener.html"><tt class="STRUCTNAME">pg_listener</tt></a></td><td>异步通知</td></tr>
<tr><td><a href="catalog-pg-namespace.html"><tt class="STRUCTNAME">pg_namespace</tt></a></td><td>模式</td></tr>
<tr><td><a href="catalog-pg-opclass.html"><tt class="STRUCTNAME">pg_opclass</tt></a></td><td>索引访问方法操作符类</td></tr>
<tr><td><a href="catalog-pg-operator.html"><tt class="STRUCTNAME">pg_operator</tt></a></td><td>操作符</td></tr>
<tr><td><a href="catalog-pg-pltemplate.html"><tt class="STRUCTNAME">pg_pltemplate</tt></a></td><td>过程语言使用的模板数据</td></tr>
<tr><td><a href="catalog-pg-proc.html"><tt class="STRUCTNAME">pg_proc</tt></a></td><td>函数和过程</td></tr>
<tr><td><a href="catalog-pg-rewrite.html"><tt class="STRUCTNAME">pg_rewrite</tt></a></td><td>查询重写规则</td></tr>
<tr><td><a href="catalog-pg-shdepend.html"><tt class="STRUCTNAME">pg_shdepend</tt></a></td><td>在共享对象上的依赖性</td></tr>
<tr><td><a href="catalog-pg-shdescription.html"><tt class="STRUCTNAME">pg_shdescription</tt></a></td><td>共享对象上的注释</td></tr>
<tr><td><a href="catalog-pg-statistic.html"><tt class="STRUCTNAME">pg_statistic</tt></a></td><td>优化器统计</td></tr>
<tr><td><a href="catalog-pg-tablespace.html"><tt class="STRUCTNAME">pg_tablespace</tt></a></td><td>这个数据库集群里面的表空间</td></tr>
<tr><td><a href="catalog-pg-trigger.html"><tt class="STRUCTNAME">pg_trigger</tt></a></td><td>触发器</td></tr>
<tr><td><a href="catalog-pg-type.html"><tt class="STRUCTNAME">pg_type</tt></a></td><td>数据类型</td></tr>
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<tr><td width="33%" align="left" valign="top"><a href="catalogs.html" accesskey="P">后退</a></td><td width="34%" align="center" valign="top"><a href="index.html" accesskey="H">首页</a></td><td width="33%" align="right" valign="top"><a href="catalog-pg-aggregate.html" accesskey="N">前进</a></td></tr>
<tr><td width="33%" align="left" valign="top">系统表</td><td width="34%" align="center" valign="top"><a href="catalogs.html" accesskey="U">上一级</a></td><td width="33%" align="right" valign="top"><tt class="STRUCTNAME">pg_aggregate</tt></td></tr>
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